@misc{indiciae9b1bbbfbdd6f,
  title = {Geologic map of the North Mamm Peak Quadrangle, Garfield County, Colorado},
  author = {J. R. Donnell and W. E. Yeend and M. C. Smith},
  year = {1989},
  doi = {10.3133/mf2093},
  url = {https://pubs.usgs.gov/publication/mf2093},
  note = {Source identifier: mf2093}
}